Rock-drilling stoping-drill.



J.. G. LEYIUEIR. BooK DRILLING sToPING DRILL.

APPLIoATIoN FILED 00Td 1s,-191o. LB2, l 62.

Patented Dec. 23, 1913.

J. G. LEYNER. ROCK DBILLING STOPING DRILL. APPLIoATIoN FILED 00T. 1s, 1910. 151982, l @Q Patented Dec. 23, 1913.

' 4 SHEETS-SHEET 2.

lll

M u ,M 1.., i--

J. G. LEYNER. ROGK DBILLING STOPING DRILL.

` APPLICATION FILM) 00T. 18, 1910. 11.982, l 62. v

. '4 SHEETS-SHEET 3.

J. G. LEYNER. y BOOK DBILLING STOPING DRILL.

` APPLIUATION 'FILED ooT. 1a '1910. QS'Q l 6% l r Patented Dec. 23, 1913.

4 SHEETS-SHEET 4.

- fr'UNITED ,STATES PATENT OFFICE.-

J- OH GEORGE LEYNER, orv DENVER, COLORADO, AssIGNoE To THE J. GEO. LEYNER ENGINEEENG WORKS COMPANY, OF LITTLETON, COLORADO, A CORPORATION or comme 5 and State-of Colorado, have invented a new ati-d useful Rock-Drilling StopingDrill, of 'which the following is a specification.

f'Myf invention relates to improvements in i. rockdrilling stoping drills, and the Objects 5 10 of my invention are,`first, to provide -an air-feeding abutment engaging stoping drill, inwhich thel cylinder and its coperating heads'v are secured together by resiliently yielding-joints; second, to provide an abut- 1=5 ment engaging air-feeding hand oscillating ffstopingdrill with resiliently yielding connections betweenitsvarious coperating in- :eiosin'g and supporting members; and third,

-tofprov'ide asi'mple automatically lubricat- '201i`ng's'toping' drill.' that is provided'with re- `siliently yielding connected parts that are so eoperatively united and arranged ermit its-'connecting parts to resiliently yie d un der-'severestrains, sudden shock and severe 25 `falls` that would tend to break their con- 'jhe'ct-mg pai-ts. I attain these objects by the .',n'echanisn'i illustrated inthe accompanying "drawings, in which:

Specication of Letters Patent.

Application filed October 18, 1910. Serial No. 587,651.

ri re 1 is a ian viwof the im med' gu p p 1 drill. Fig. 2 is a vertical, longitudinal, .sectional view of the same. Fig. 3 isa horizontal, sectional view of the hamlmer piston cylinder casing on the axial lane of thethrottle valve, the said valve l Alsgeiiig shown in full lines. Fig. 4 is a horifrontal, sectional view through the valve che'stof the cylinder casing, the valve and -end plugs'bei'ng omitted. Fig. 5 is a rear lend view of the cylinder casing. Fi 6 is a' vertical, transverse, sectional View t e`r'eof on the line 6 6 ofFig. 4. Fig. 7 is a bottom view of the same, showing the oil reservoir and passages connecting it with the cylinder. Fig. 8 is aside view of the throttle valve.'v Fig. A9 is a view of the opposite side of the said valve. Fig. `10 is a transverse,

sectional view. thereof on the line 10-1 0 of Fig. 8. Fig. 11 is a vertical, longitudinal, sectional view through the ported portion of 0 the said valve. Fig; .12 is a vertical, transverse, sectional view of the back yhead in which'the drill rotating handle is clamped.

Eig, 13 is an end view df therear cylinder' headlifig. 14 is a longitudinal, sectional view of the same. Fig. 15 is an end View of ROCK-DRILLING STOPINfG-DRILL.

Patented Deo. 23, 1913.

the combined front cylinder head and striking pin bearing. Fig. 16 is a horizontal, scctional view thereof. Figs. 17 and 18 are side and front views, respectively, of thev drill chuck. Figs. 19 and 20 are front and edge views, respectively, of the side rod washer plate; and Fig. 21 is a side View of a hexagonal form of drill bit.

Similar letters of reference refer to similar parts throughout t-he several views.

Referring to the drawings, the numeral 1,

designates the cylinder portion of the casing of'my improved I'stoping drill, in which a hammer piston 2 is reciprocally mounted.'

3 designates the front cylinder head,

which is provided with a hub portion 4,

that {it-s snugly but loosely into the cylindrical bore 5 of the cylindrical casing 1.

The front cylinder head is provided with an axial bore of twodiameters, in which a striking pin 6 of two diameter portions is mounted to move recipi'ocally a shortdistance. .T he smaller diameter portion 7 of this striking pin I term the pistonv striking en d, and this end projects throughl the smaller diameter portion 0f the head into the axial here of the cylinder l and into the reciprocal path of `the hammer piston 2 'far enough t0 be driven forward by the hammer piston on its reciprocal strokes. The larger diameter portion 8'of thestriking pin I term its drill bit striking end portion, and it tits reeiproeally in the larger diameterv bore of the front cylinder head, and it is adapted to have a, ;sliort forward and rearward feeding mog'em'ent of about a half of an inch to compensate for the automatic feeding movement --of the stoping drill, and the roclr drillin s'peed` of the Adrill bit driving blows of t e hammer piston. r The reciprocal movement of the drill bit striking end of the striking pin is defined by the adjacent end ofa drill bit supporting sleeve 9,1 which I term the drill bit4 shank ends ot' hexagonal tool steel drill bits 11. The shank portions of the drill bits are used in the chuck in their natural bar and are without lugsor collars, and are not increased or diminished in size, and they extend looselyy into the sleeve against .the striking pin.' The rock crushing lips 12 of the drill bit. strike against the rock While drillingl a hole in rock, as will be explained more tully hereinafter.

The front head 3 is provided with oppositely extending air vent apertures 13, which are preferably positioned at the top and bottom sides of the saine, and are adapted to permit any air that may leak trom the cylinder past, the striking pin into the aperture in the head tromcushioniiig the strikingpin, thus preventing its striking the drill bit with the yfull torce of the blow of the hammer piston.`

'l` he hammer piston is a plain cylindrical plugshaped piston, with tlat ends and preterably without piston rings.A Its reciprocal movement is detined Vby the striking pin supporting front` cylinder head, and a rear cylinder head 14, which tits against the rear end ot' the cylinder, and is provided with a huh portion 15 that projects into it a short distance. This rear cylinder head is also provided with a rearwardly projecting hub'A extension, which is formed into two reduced stepportions 1G and 17, as shown in Figs;

2 and 14. 'lhe step portion 1G is arranged to receive the forward end of an air-feed tube 18, which tits snugly but loosely over it, and the step 17 is of smaller diameter and is provided wit a collar end portion 19. The` stepl'l is adapted'to receive and retain be tween its collar 19 and its adjacent step portion 16 an air-feed retaining ring 20, which is a split expansive steel ring that is sprung overthe collar portion 19 and tits within an axial recess 21, formed in the front end of the piston head of the air-tccd tube 18. This iston head 22 is a plug-shaped circular piston head whichlis provided with a threaded axialaperture 9.3, in which a reduced threaded end portion on the inner end of a piston rod 24 is screwed. A washer 25 of metal or other rigid material is .plac/ed on the reduced threaded end ot the piston rod against the shoulder Q6 toi-med between the threaded portion and the body of the piston rod, and the adjacent end ot the piston head is provided with a reduced step portion 28, around which a resiliently expandingsteel ring 28^ is placed and over this spring ring :28A the circumferential band portion ot' a cup shaped washer 29 ot leather or other suitable material is placed. The body vportion ot this cupped washer isflnountcd on the threaded end of the piston rod between the metal washer and the adjacent end ot' the piston head. The expanding ring Q8^ acts to press the leather washer against the circular wall lot the piston bore ot the,air-feed tube, The

.front end lportion'ot the air-feed tube extends into ajj' is secured to a sleeve 31, preferably by lieing expanded therein, which sleeve I term the back-head of the stoping drill. This back-head hears against the rear cylinder head, and on its opposite side projecting lug portions $53 are formed, and the front cylinder head,`the drill bit supporting chuck and the cylinder casing are also provided on their opposite side portions-with lugT portions 34, which are also arranged in alinement with the lugs `-of the back-head. The lugs of these parts are all provided with apertures 35, which are adapted to receive bolt-rods 36. These boltrods 3G extend loosely through the apertures in the lugs and are provided with heads 37 that tit against the outside vot 'the lugs of the chuck, which are provided with recesses 38 that are adapted to receive the heads of the bolts', opposite sides of'whi'ch `heads are adapted to tit between and against tl1-`sides ot the recesses and hold the bolts Tagainst turning in the apertures of the lugs'. The opposite ends of these bolt rods extend through and beyond the lugs-on the back cylinder head and through the'apertured ends of a washer plate 39, which is mounted loosely on the feed tube 1S, andl coi-l springs 40 are interposed between the plate 39 and the back head 31. The ends of the rods are threaded to receive nuts 41. The coiled springs are adapted to be compressed Vby,

vscrewing the nuts 41 against 'the Washer plate', 'and the tension under which theV springs are thereby held causes them to exert an outward pull on the rods and also a pressure upon the back head which clamps the cylinder, itc. head portions and the chuck j together in alinement and with a resilient pressure that permits each piece orall of them together to yield under torsional or twisting strains, or sudden jars, thus preventing breakage or disa1"angcment of the said parts and their interior coperatingr members. In order to secure the nuts 41 of these boltslagainst accidental movement thatl would relieve the springs of their adjusted tension, I provide their washer engaging 'faces with transversely-arraaged ribs or keys 42, which are adapted to be engaged by grooves 43 in the adjacent face of the washer plate, into which grooves the keys sl ip as the nutsare turned on the rod against the plate, the nuts being tlnally stopped with their keys resting in thc `groove of the plate when the springs are compressed to the 'required tension to clamp the cylinder and its heads and the chuck together.

'lhe back head 3l is provided with a projecting hub portion l-t, through one side ot which a' slot 45 is torna-d along the opposite edges of which twolugs 'l-t are formed,

through which a bolt 4:7 is extended, and is adapted to clamp the lugs and the sides of the hub together around one end of a hand operated lever 48, which is preferably partially threaded or is otherwise removably secured to it, and is arranged to be clampedI tightly in it against accidental movement or displacement. The opposite end of this lever is turned 'at rightangles to its length to form a handle that can be grasped by an operator easily and quickly in any position in which the stopino' drill is placed. lThis handle is employed y an attendant to oscillate the stoping drill whenV in operation, as .it is necessary that the drill bit be turned or moved or partially rotated in alternate directions while drilling rock, as will be described more fully. hereinafter. The airfeed tubeextends rearwardly from the back head and may be maderof any predetermined length that will enable the stoping drill to be easily and quickly handled. I preferably make this vair-feed tube about thrtyvinches longand its outer'end is threaded and is adapted to receive'a cap 49 through which the pistonrod extends. This cap comprises a cylindrical portion, which lits over the end y 4of vthe air-feed tube and -a hub portion through which the piston Arod 24 passes. The interior ofthe cylindrical portion is threaded adjacent to the hub endthereof to receive the threaded end ofthe air-feed tube. This cylindrical portion is slotted and apertured lugs 4tlfareformed on opposite walls of the slot, which receive a` clamping bolt 51 by which the cap may be clamped upo'n the endof the tube against accidental displacement.A The hub of the cap at its junction with-the cylindrical portion is formed with a hexagonal wrench receiving portion 49A, as shown in Fig. 1. This piston rod 24 I term an abutment engaging piston rod, as it is adapted to be held stationary-against any part of the side walls or of the floor or roof of the stope portions of mines, or against any suitable stationary block or other `object that is made to act as an abutment for it, as will be more fully explained hereinafter.

A small air vent-aperture 52 is formed through the shell of the air-feed tube, which is adapted to allow the air in the tube bchind the pistou to escape as the piston moves forward. and this aperture also permits the actuatiugair to exhaust when the piston reaches the limit of its outward movement. 'l'he piston rod extends from the piston head ol the air-feed tube through aud beyond the end of the air-leed tube a short. distance, and its terminal end is tapered to a point, as shown.

'l'he drill bit driving hammer piston 2 iu the c vliuder l is operated by a valve. that is iucloseiin a valve chest 5(. which l'ornis a part oi' and is preferably cast integral with it. This valve chest has a cylindrical bore 57, formed through it, which forms a valve seat for a stem and collar form of valve 58, which tits snugly but reciprocally in the' said bore.. The opposite end portions of this bore are threaded and plugs 59 are threaded to them. The outside ends of the plugs are provided with head portions that screw. up against the ends ofthe valve chest, and these head portions are provided with surfaces adapted to receive a wrench for insertin the plugs into and for removing them rom the valve chest. The valve comprises a stein portion having-collar portions 61 4and 62 at its-opposite ends, and two collar portions 63 and 64 intermediate of its ends at predetermined equal distances from its ends and from the center of its length, said collars being arrangedto cover two cylinder inlet ports 65 and 66 and to control two exhaust ports 67 and 68. The eylindcr'inlet 4ports 65 and 66 extend from the valve seat to the opposite 'ends of the hammer piston cylinder, while the exhaust ports -67 and y 68 extend from the valve seat into an exhaust outlet aperture 69formed in and along the top of the valve chest thatopens to the atmosphere at the rear end of the valve chest.;` The air inlet ports are placed at each side of the center of the length of the valve' seat, and are controlledfby the inside collars .of the valve, and`eentrally between them an annular entrance port 70 is formed, which ,port communicates with' a conical valve scat A`71, which forms a continuation of an air inlet port 72, which is 4formed in .a hub 73 cast on one side of the cylinder casing. The entrance to this air inlet hub 73 is threaded and a bushingy 74 is threaded in it, which is provided with an inwardly flaring tapering aperture in which the tapering end pol"- ion of an elbow 75 lits, the outer end of which is threaded to receive a hose coupling nipple 76. The valve seat 71 is provided with a throttle valve 77, which may consist of any suitable form of air controlling valve, but I preferably, however. use a valve hav ing a tapered tubular portion which is seati ed in the tapered or conical seat 7l, and which is provided with a port 79, which is adapted to register willi the entrance port 'T0 in the cylindrical valve seat 57, a ground joint beingr termed between this tapering,r tubular valve aud its tapering seat. 'l`hesteiii et the valve extends through a' luib on the. opposite side el' the casing, and a handle 79 is secured to its projecting end. preferably liv beine' bolted thereto by :i bolt St). siuall air port Sl isfdrilled horizontally into the valve chest l'roui the outside, and has its outer end closed by a plug. 'lhis port communicatesl with the tapered i'alre seat 7l,- so as to be controlled by the tubular throttle valve, and it, is inter.-;eeled b v a substantially vertical drilled port S2, the entrance of against the piston 22.

which is also closed by a plug, and this port 82 also intersects the inner end. of a horizontal port 88, that is drilled into the end portion of the valve chest. -This port 83 communicates with an annular groove 8st, that is formed in the .inner face of the rear cylinder head, which groove forms a dis tributixw port from which extend a plurality of obliqucly arranged ports 85, which communicate with an axial chamber 8G in the rearwardly extending hub portion of the rear cylinder head, from which chamber the air acts directly on the piston head 22 ofthe piston rod 24 of the air-feed tube 18, and pushes it outwardly through the airfeed tube until it reaches its outer end cap` when the air `escapes to the atmosphere through the vent exhaust aperture 52.

The port 78 in the throttle valve communicates with au axial port 78A in the body of the valve, and the port 7 8^ communicates withthe inlet port 72. A port 78 is formed in the periphery of the throttle valve and extends from one side of the port 7 8 substantially a. fourth of the way around the periphery of the valve. This port is adapted to 'communicate with the port 81 when the valve is open or in the position shown in Fig. 3, so that air may pass from the port 78 tothe port 7 8B and thence through cylinder ports 81, 82 and 88 and ports 84 and 85 in vthe rear cylinder head to the cylinder head chamber 86, whence it acts directly raised the air is cut off both from the airfeed=cylinder and from the drill cylinder, and a slight. groove or port 78C is eut in the j edge of the port 78 opposite the port 7 8.

the interior of the air-feed tube 18, in order that it may act on the feed piston 22 and thus start the whole drilling engine and the feed tube 18'away from the piston and feed the drill-bitagainst the rock before air is admitted to the hammer piston and consequently before the hammer piston starts to reciprocate against the drill-bit. r"

The valve is provided with an exhaust port groove 78D, which is open to the atmosphere. at one end and which is arranged to permit the air to exhaust from the feed tube 18 back through the ports 85, 811,. 83, 82 and 811 and this groove 78D to the atmosl'ihere.

The slide valve 58 is operated inthe following manner: Ports 58A'and 58 respectively are drilled in from'opposite ends of the valve chest casing and parallel with the bore of said easing, as shown in Fig. 4, and their outer ends are plugged. These ports 4are intersected by horizontal ports 58C and 58 respectively, which are drilled through from the outside of the chest into its bore,

these holes entering the chest a slight distance back of the inner ends of plugs 59,

'When the valve'is` which inner ends are reduced in diameter, as shown in Fig. 2, to permit the entrance ofair to the chest. The inner ends of the ports 58A and 58L are intersected by vertical ports 58E and 58F respectively, which enter the hammer piston cylinder 5. Air enter ing the rear end of the cylinder through inlet port 65 throws the hammer piston forward, and when its rear end uncovers the port 58E, air passes through saidport and through ports 58A and 58C to the rear end of the valve chest and throws the valve 58 to tbe forward end of the chest, as shown in Fig. 2, thereby opening-port- 66 and admitting air to the forward end of the cylinder, while atvthe same time the air behind the hammer-piston exhausts through the ports 65, 67 and 69. The hammer piston is now thrown to the rear and when its forward4 end uncovers the port 58F alr is admitted te the chest in front of the valve through the ports 58F7 58Bl and 58D and the valve is thrown to the rear end of the chest, thereby opening port 65 and' permitting the air in front of the hammer piston to exhaust through ports 66, (S8-and 69.

The end collars .6l and 62 of the slide valveare provided with small .exhaust ports' mer piston in time to cushion the piston 'on' its rear stroke and thus prevent it froi striking the rear cylinder head 14.

An oil reservoir 87 is formed upon the bottom of the cylinder, into the opposite ends of which plugged core holes 88 are formed. A

Passages 89 and 90 are drilled in 'from opposite ends of the cylindercasing and o n opposite .sides of the oil reservoir to points substantially midway -of the length ofthe reservoir, and the inner ends of these pssagesrare intersected by drilled passages 91 and 92 respectively, which extend through the cylinder casing 'and into the cylinder,

the outer ends of ,all of said passages beingv The oil works from the reservoir to the cylinder in the manner above described, and the hammer piston which covers passages 91 and 92 at all times as it reciprocates, Wipes it up and distributes it throughout the cylinder, from which it works into the valve chest through its ports to the slide valve 58.

The stoping'drill 'is adapted to be used in drilling holes at any4 required oblique angle, as well as in horizontally inclined positions, and during the reciprocating movement of the hammer pist-on a small quantity of air will leak into the reservoir, and' when the drill is inclined upward this air may escape back into the piston through the ports 94, 90 and 92, and when the drill is in a reverse position the air may escape through the ports 93, 89 and 91, to prevent expanding air forcing oil out when the piston is not in operation.

A complete description of'the principle of the operation of this method of cylinder lubrication may be found in Patent No. 958,260, issued to -me May 17, 1910, for cylinder lubrication. I j

The ope-ration of my improved stoping drill is as ollows': The elbow 7 5 is connected to a hose, which I do not `illustrate, but.

which extends to a supply of' compressed air of from about 60 to 100 pounds pressure, which is admitted by the operator to the valve, which is reciprocated in its seat and admits compressed air alternately to the opposite ends of the cylinder to reciprocate the hammer pistons, and as the said piston reciprocates it inipinges against. the end ot' the striking pin 6, which is driven against the end of the drill bit, and drives it forward. The drill bit is fed forward into rock by the air-feed tube,A in the following manner: The attendant places .the point of the abutment engaging piston rod against the floor oi" one of the side walls of the mine stope in which the drill is beingused, or against any suitable abutment, such as a 'block of wood, and then turns on justenough air to move the drill forward until the drill bit engages the rock. The port 78C of the throttle valve opens communication between the inlet and the port 81, which admits air to the piston 22 before air is admitted to the hammer piston cylinder, and thus allows the drill to be set before the hammer piston is actuated. The operator then turns on the air with full force, which rcciprocates the hammer piston and drives the striking pin against the drill bit, and the striking pin drives the drill bit against. the rock; the operatoi' then grasps the drill oscillating handle, and oscillates the entire stopingr drill and drill bit with a, partial rotative movement, the drill being pivolally supported by the point of the drill bit hearing against the rock and the point of the piston rod bearing against the abutment.

The drin ba is forced against the rock with then pushes the air-feed tube down on'the" piston head and takes out the drill bit and substitutes for it a longer one, and thenA places this longer drill bit into and against the bottom of the hole` already drilled,'and replaces thc point of the piston rod against its abutment, and again turning on lthe air, drills the hole to the extent-of the ,feeding distance ofthe air-feed tube, andrepeats this operation unt-il a hole of the desired depth is attained.

My invention provides a simple, thoroughly practical, and highly eiicent'stopingdrill, that is economical in the use .of air and one that is light enough to be easily and quickly handled by a single operator.

Having described my invention, what I claim as new and desire to secure vby Letters Patent is:

1. A stoping-drill having a cylinder with afront cylinder-head and a rear cylinderhead, a t-ubular casing mounted on said rear cylinder-head, a feed-piston within saidv tubular casing,a plate loosely mounted on said tubular casing, side-rods connecting said front cylinder-head said rear cylinder head and said plate, and coil springs about said side-rods interposed between said rear cylinder-head and said plate, whereby lsaid cylinder-heads and said plate are yieldingly clamped together.

2. A sloping-drill having-a cylinder with a front cylinder-head and-a rear cylinderhead provided with-two step-like shoulder- "portions, a feed-piston, a tubular casing for the feed-piston secured upon one4 of said shoulder portions, meansjor supplying com-v pressed air through said rear cylinder-head into said casingva rim extension on the head'` of said feed-piston adapted to move over the other shoulder portion when said feedpiston is drawn within the casing, and a retaining-ring'about the second shoulder portion. A

3. A stoping-drill having a cylinderwith a front cylinder-head and a rear cylinder'- liead provided with a rearward extension having an axial chamber therein. means for .supplying compressed air to and exhai'istng it Afrom said chamber. front shoulder' on said rear'cylinderhcad fitting within the cylinder, a rear shoulder on said rear cylinder-head, a feed-piston, a tubular casing for the feed-piston secured upon said rear cylin-l der-head,` a plate loosely mounted on said tubular casing, and means connected with said' plate for yieldingly clamping said tubular casing and said rear cylinder-head to the front cylimier-head.

- 4. A stoping-drill having a cylinder'with a front cylinder-head and a rear cylinderhead provided with an annular groove on its front surface, a rearwardlj)r opening axial chamber, and ports connecting said groove and said chamber; means for supplying and exhausting compressed air through said groove and ,portsg a front shoulder'on said rearcylinder-head fitting within the cylinder; a rear shoulder on said rear cylnderhead; a fecd-piston; a tubular casing for the feed-piston-seeured upon said rear shoulder; and means for yieldingly clamping said tubular casing and said rear cylinderhead to the front cylinder-head. p 5. A stoping-drill having a cylinder with a front cylinder-head and afrear cylinderhead provided with an annular groove on 1 its front. surface, a rearwardly opening axial chamber, and ports connecting said groove and said chamber; means for supplying and exhausting compressed air through said groove and' ports; a frontshoulder on said rear cylinder-head fitting within the cylinder; two steplikc shoulder portions ,on the rear side of said rear cylinder-head; a feedpiston; a tubular casing for the feed-piston secured upon one of said shoulder portions; a rim extension ou the head of said feedpiston adapted to more over the other shoulder portion when said feed-piston is drawn wit-hin the casing; a retaining-ring about the second shoulder portion; and moans for yielding-ly clamping said tubular casing and said rear cylinder-head to the front cylinder-head.

In testimony whereof I ailix my Signat-ure in presence of two witnesses.

JOHN GEORGE LEYNER.

Vitnesses G. SARGENT ELLIOTT, ROBERT J. VVALTMAN, 

